author | Claus Gittinger <cg@exept.de> |
Mon, 05 Mar 2007 13:34:37 +0100 | |
changeset 1995 | dad0adb22a38 |
parent 1805 | d8f8075615dc |
child 2118 | 8ba726417c70 |
permissions | -rw-r--r-- |
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" |
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COPYRIGHT (c) 1989 by Claus Gittinger |
47 | 3 |
All Rights Reserved |
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This software is furnished under a license and may be used |
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only in accordance with the terms of that license and with the |
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inclusion of the above copyright notice. This software may not |
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be provided or otherwise made available to, or used by, any |
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other person. No title to or ownership of the software is |
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hereby transferred. |
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" |
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"{ Package: 'stx:libcomp' }" |
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PrimaryNode subclass:#ConstantNode |
242
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instanceVariableNames:'' |
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classVariableNames:'TrueNode FalseNode NilNode Const0Node Const1Node Float0Node' |
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poolDictionaries:'' |
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category:'System-Compiler-Support' |
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! |
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||
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!ConstantNode class methodsFor:'documentation'! |
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||
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copyright |
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" |
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COPYRIGHT (c) 1989 by Claus Gittinger |
|
47 | 26 |
All Rights Reserved |
20 | 27 |
|
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This software is furnished under a license and may be used |
|
29 |
only in accordance with the terms of that license and with the |
|
30 |
inclusion of the above copyright notice. This software may not |
|
31 |
be provided or otherwise made available to, or used by, any |
|
32 |
other person. No title to or ownership of the software is |
|
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hereby transferred. |
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" |
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! |
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||
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documentation |
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" |
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node for parse-trees, representing literal constants |
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This is a helper class for the compiler. |
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[author:] |
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Claus Gittinger |
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" |
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! ! |
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||
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!ConstantNode class methodsFor:'instance creation'! |
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||
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type:t value:val |
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"some constant nodes are used so often, its worth caching them" |
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(t == #True) ifTrue:[ |
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TrueNode isNil ifTrue:[ |
53 |
TrueNode := (self basicNew) type:t value:val |
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]. |
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^ TrueNode |
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]. |
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(t == #False) ifTrue:[ |
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FalseNode isNil ifTrue:[ |
59 |
FalseNode := (self basicNew) type:t value:val |
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]. |
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^ FalseNode |
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]. |
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(t == #Nil) ifTrue:[ |
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NilNode isNil ifTrue:[ |
65 |
NilNode := (self basicNew) type:t value:val |
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]. |
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^ NilNode |
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]. |
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(t == #Integer) ifTrue:[ |
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(val == 0) ifTrue:[ |
71 |
Const0Node isNil ifTrue:[ |
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Const0Node := (self basicNew) type:t value:val |
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]. |
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^ Const0Node |
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]. |
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(val == 1) ifTrue:[ |
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Const1Node isNil ifTrue:[ |
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Const1Node := (self basicNew) type:t value:val |
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]. |
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^ Const1Node |
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] |
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]. |
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(t == #Float) ifTrue:[ |
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(val = 0.0) ifTrue:[ |
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"/ care for negative0 (which compares = to 0.0) |
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val isNegativeZero ifFalse:[ |
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Float0Node isNil ifTrue:[ |
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Float0Node := (self basicNew) type:t value:val |
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]. |
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^ Float0Node |
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] |
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] |
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]. |
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^ (self basicNew) type:t value:val |
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! |
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value:val |
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^ self type:(self typeOfConstant:val) value:val |
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! ! |
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||
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!ConstantNode class methodsFor:'queries'! |
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typeOfConstant:anObject |
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"return the constantNode type for an object" |
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||
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"the most common case first ..." |
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(anObject isMemberOf:SmallInteger) ifTrue:[ |
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^ #Integer |
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]. |
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anObject isNil ifTrue:[ |
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^ #Nil |
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]. |
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anObject isNumber ifTrue:[ |
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"the most common case first ..." |
118 |
(anObject isMemberOf:Float) ifTrue:[ |
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^ #Float |
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]. |
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anObject isInteger ifTrue:[ |
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^ #Integer |
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]. |
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]. |
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(anObject == true) ifTrue:[ |
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^ #True |
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]. |
128 |
(anObject == false) ifTrue:[ |
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^ #False |
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]. |
131 |
^ #Literal |
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! ! |
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||
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!ConstantNode methodsFor:'accessing'! |
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lineNumber:ignoredLineNumber |
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"Created: / 14.5.1998 / 19:31:48 / cg" |
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! ! |
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!ConstantNode methodsFor:'code generation'! |
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codeForSideEffectOn:aStream inBlock:b for:aCompiler |
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"no code at all" |
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145 |
|
1995 | 146 |
"/ but remember symbolic literals (such as #TODO) |
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value isSymbol ifTrue:[ |
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aCompiler addLiteral:value. |
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]. |
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^ self |
1995 | 151 |
|
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"Modified: / 04-03-2007 / 15:29:54 / cg" |
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! |
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154 |
|
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codeForSimpleReturnOn:aStream inBlock:b lineNumber:lineNrOrNil for:aCompiler |
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lineNrOrNil notNil ifTrue:[ |
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self codeLineNumber:lineNrOrNil on:aStream for:aCompiler |
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]. |
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|
159 |
|
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(type == #Nil) ifTrue:[ |
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161 |
aStream nextPut:#retNil. |
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^self |
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|
163 |
]. |
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|
164 |
(type == #True) ifTrue:[ |
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aStream nextPut:#retTrue. |
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166 |
^self |
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|
167 |
]. |
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|
168 |
(type == #False) ifTrue:[ |
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aStream nextPut:#retFalse. |
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^self |
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]. |
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|
172 |
|
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173 |
(type == #Integer) ifTrue:[ |
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174 |
(value between: -128 and:127) ifTrue:[ |
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|
175 |
(value == 0) ifTrue:[ |
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|
176 |
aStream nextPut:#ret0. |
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^ self. |
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|
178 |
]. |
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|
179 |
aStream nextPut:#retNum; nextPut:value. |
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^ self |
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|
181 |
]. |
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182 |
]. |
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|
183 |
|
1401 | 184 |
"/ anything else must be pushed, then top returned |
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|
185 |
|
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|
186 |
self codeOn:aStream inBlock:b for:aCompiler. |
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|
187 |
aStream nextPut:#retTop |
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188 |
! |
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|
189 |
|
104 | 190 |
codeOn:aStream inBlock:b for:aCompiler |
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|
191 |
"generate code for the constant" |
0 | 192 |
|
104 | 193 |
|code index| |
96 | 194 |
|
0 | 195 |
(type == #Integer) ifTrue:[ |
843
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|
196 |
(value between: -128 and:127) ifTrue:[ |
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|
197 |
(value == 0) ifTrue:[ |
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|
198 |
code := #push0 |
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|
199 |
]. |
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|
200 |
(value == 1) ifTrue:[ |
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|
201 |
code := #push1. |
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|
202 |
]. |
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|
203 |
(value == 2) ifTrue:[ |
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|
204 |
code := #push2. |
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|
205 |
]. |
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|
206 |
(value == -1) ifTrue:[ |
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|
207 |
code := #pushMinus1. |
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|
208 |
]. |
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|
209 |
code notNil ifTrue:[ |
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|
210 |
aStream nextPut:code. ^ self |
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|
211 |
]. |
96 | 212 |
|
843
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|
213 |
aStream nextPut:#pushNum; nextPut:value. |
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|
214 |
^ self |
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|
215 |
]. |
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|
216 |
(value between:16r-8000 and:16r7FFF) ifTrue:[ |
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|
217 |
aStream nextPut:#pushNum16; nextPut:value; nextPut:0. |
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218 |
^ self |
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|
219 |
] |
0 | 220 |
]. |
221 |
(type == #Nil) ifTrue:[ |
|
843
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|
222 |
code := #pushNil. |
0 | 223 |
]. |
224 |
(type == #True) ifTrue:[ |
|
843
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|
225 |
code := #pushTrue. |
0 | 226 |
]. |
227 |
(type == #False) ifTrue:[ |
|
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|
228 |
code := #pushFalse. |
0 | 229 |
]. |
96 | 230 |
code notNil ifTrue:[ |
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|
231 |
aStream nextPut:code. ^ self |
96 | 232 |
]. |
106 | 233 |
|
234 |
"/ kludge for backward compatibility |
|
235 |
aCompiler isNil ifTrue:[ |
|
1805
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|
236 |
self halt. |
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|
237 |
aStream nextPut:#pushLit; nextPut:value. |
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|
238 |
^ self. |
106 | 239 |
]. |
240 |
||
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|
241 |
self emitPushLiteral:value on:aStream for:aCompiler |
0 | 242 |
! |
243 |
||
104 | 244 |
codeStoreOn:aStream inBlock:codeBlock valueNeeded:valueNeeded for:aCompiler |
13 | 245 |
"not sent - parser checks for this" |
0 | 246 |
|
247 |
^ self error:'assignment to literals not allowed' |
|
248 |
! ! |
|
249 |
||
1035 | 250 |
!ConstantNode methodsFor:'enumerating'! |
539
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|
251 |
|
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|
252 |
nodeDo:anEnumerator |
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|
253 |
"helper for parse tree walking" |
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|
254 |
|
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|
255 |
^ anEnumerator doLiteral:self value:value |
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|
256 |
|
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|
257 |
"Modified: 19.6.1997 / 16:40:59 / cg" |
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|
258 |
! ! |
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|
259 |
|
1035 | 260 |
!ConstantNode methodsFor:'evaluation'! |
140 | 261 |
|
262 |
evaluate |
|
1384 | 263 |
"exists for performance only" |
264 |
^ value |
|
265 |
! |
|
266 |
||
267 |
evaluateIn:anEnvironment |
|
140 | 268 |
^ value |
269 |
! |
|
270 |
||
271 |
store:aValue |
|
272 |
"not reached - parser checks for this" |
|
273 |
||
274 |
self error:'store not allowed'. |
|
275 |
^ aValue |
|
276 |
! ! |
|
277 |
||
1080 | 278 |
!ConstantNode methodsFor:'printing & storing'! |
0 | 279 |
|
13 | 280 |
displayString |
612 | 281 |
"return a printed representation of the receiver for displaying" |
282 |
||
13 | 283 |
^ value displayString |
612 | 284 |
|
285 |
"Modified: 20.9.1997 / 11:39:07 / cg" |
|
13 | 286 |
! |
287 |
||
0 | 288 |
printOn:aStream indent:i |
289 |
value storeOn:aStream |
|
290 |
! ! |
|
140 | 291 |
|
292 |
!ConstantNode methodsFor:'queries'! |
|
293 |
||
242
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294 |
canReuseAsArg:anotherNode |
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|
295 |
|otherValue| |
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|
296 |
|
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|
297 |
anotherNode isConstant ifTrue:[ |
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298 |
anotherNode type ~~ type ifTrue:[^ false]. |
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|
299 |
|
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300 |
otherValue := anotherNode evaluate. |
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301 |
(value isMemberOf:SmallInteger) ifTrue:[ |
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|
302 |
(value == 0) ifTrue:[^ false]. |
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|
303 |
(value == 1) ifTrue:[^ false]. |
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|
304 |
(value == 2) ifTrue:[^ false]. |
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|
305 |
(value == -1) ifTrue:[^ false]. |
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|
306 |
^ otherValue == value |
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changeset
|
307 |
]. |
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changeset
|
308 |
(value isMemberOf:Float) ifTrue:[ |
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|
309 |
^ (otherValue isMemberOf:Float) |
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|
310 |
and:[otherValue = value] |
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changeset
|
311 |
]. |
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|
312 |
(value isMemberOf:Symbol) ifTrue:[ |
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|
313 |
^ otherValue == value |
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changeset
|
314 |
]. |
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changeset
|
315 |
(value isMemberOf:String) ifTrue:[ |
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|
316 |
^ (otherValue isMemberOf:String) |
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|
317 |
and:[otherValue = value] |
3cca9ffd2620
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diff
changeset
|
318 |
]. |
3cca9ffd2620
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148
diff
changeset
|
319 |
]. |
3cca9ffd2620
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diff
changeset
|
320 |
^ false |
3cca9ffd2620
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148
diff
changeset
|
321 |
|
3cca9ffd2620
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diff
changeset
|
322 |
"Created: 14.4.1996 / 00:43:14 / cg" |
3cca9ffd2620
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parents:
148
diff
changeset
|
323 |
"Modified: 14.4.1996 / 01:00:29 / cg" |
3cca9ffd2620
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Claus Gittinger <cg@exept.de>
parents:
148
diff
changeset
|
324 |
! |
3cca9ffd2620
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Claus Gittinger <cg@exept.de>
parents:
148
diff
changeset
|
325 |
|
140 | 326 |
isConstant |
327 |
^ true |
|
328 |
! ! |
|
329 |
||
148 | 330 |
!ConstantNode class methodsFor:'documentation'! |
331 |
||
332 |
version |
|
1995 | 333 |
^ '$Header: /cvs/stx/stx/libcomp/ConstantNode.st,v 1.42 2007-03-05 12:34:37 cg Exp $' |
148 | 334 |
! ! |